Self explanatory. The Scaling option is visible, only just not editable in the animation window. This suggestion would allow the scaling variable to be edited during a frame of an animation. Preferably it would interpolate with the rest of the animation, but if not then snapping to it would still be useful.

Uses:

• For occasions in which changes to Pehkui Variables such as Hitbox Width & Height impede normal gameplay, Gestures, or Sneaking for example could be used to temporarily revert to a vanilla hitbox for purposes of playing the game.
• Animations that temporarily change scale for whatever reason that would be needed.

Would like to add to this:

Making this would allow players to have WILD control of their attributes from their gesture menu, compromising some SMP experiences. some safety settings would need to be added. Id like to suggest adding them as admin command settings, different from the original set scaling safety toggles, saved per world, in a command similar to:

"/cpm dynamicscaling enabled (attribute/scale or all) true/false"

an alternative is adding them as profiles, where "disabled" is default, "enabled" is no restrictions, and lastly "sizeOnly" restricts everything BUT size related scales like Model Height and Width, Hitbox Height and Width, Eye height, Etc.